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Using Geochemical Method to Distinguish Lateral Migration and Vertical Migration in Rifted Basin: A Case Study from Eastern Lujiapu Depression in the Kailu Basin, NE China

机译:用地球化学方法识别裂谷盆地的横向运移和垂直运移-以内陆开鲁盆地陆家堡东部De陷为例

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摘要

摘要:迁居分别诊断在迁居距离通常是在沙的床上的短、侧面的移植的 rifted 盆是复杂的,沿着差错的垂直移植被共存。从 GCMS 分析的量的数据使区分侧面、垂直的移植效果可能。从 Jiaolige 油矿发现的油,东方 Lujiapu 消沉与类似的成熟从单身的来源岩石被导出,它是一个理想的盒子学习迁居分别效果。在油之中的组合差别被迁居分别任何一个大部分沿着差错在沙床上或垂直地旁边地引起。微妙的成熟差别被在氮混合物上有某些影响的经典的浸透的烃参数估计。在某个成熟范围,到 alkylcarbazoles 的暴露的异构体的盾和半盾异构体的比率与迁居分别在一个相反的方向随着成熟变化,它可以隐藏迁居影响。然而,移植和成熟在 alkylated carbazoles 和 benzocarbazole 的绝对集中上有一样的效果[一]/([ 一]+[c ]) 比率,它为迁居方向评价提供一个理想的工具。在不同样品之中的连续变化在沙的床上反映增加的移植距离,当突然的变化可以显示移植水管系统的变化时。综合两 geochemical 解释并且地质抑制,不是仅仅迁居方向能被决定,而且通过沙的床的水管系统或差错能被认出。
机译:Migration fractionation diagnosis is complicated in rifted basins where migration distance is generally short and lateral migration in sandy beds and vertical migration along faults are co-existed. Quantitative data from GC-MS analysis makes it possible to distinguish lateral and vertical migration effects. Oils discovered from the Jiaolige oilfield, eastern Lujiapu Depression are derived from single source rock with similar maturity, which is an ideal case to study the migration fractionation effects. Compositional differences among oils are largely caused by the migration fractionation either laterally in sand beds or vertically along the faults. Subtle maturity differences are assessed by the classic saturated hydrocarbon parameters which have certain influence on nitrogen compounds. In a certain maturity range, the ratios of shield and semi-shield isomers to the exposed isomers of alkylcarbazoles change with maturity in an opposite direction with migration fractionation, which may conceal the migration influence. However, migration and maturation have the same effects on absolute concentrations of aikylated carbazoles and benzocarhazole [a]/([a]+[c]) ratios, which provides an ideal tool for migration direction assessment. Continuous variations among different samples reflect increased migration distance in sandy beds, while abrupt changes may indicate the change of migration conduit systems. Integrated both geochemical interpretation and geological constrains, not only migration direction can be determined, but also the conduit systems through the sandy beds or the. faults can be recognized.

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